Not that it changes your basic point much, but that video is not what it claims to be. Apparently the uploader swiped footage shot from a modified Phantom II reaching 4950 feet a couple years ago. Still too high obviously, but it puts 9000 and certainly 12,500 into question (especially where off the shelf equipment is concerned).

We still have no idea what really happened? I think we do.
Which account makes more sense? Or better yet which account makes no sense? The original version would be a tough sell without the overtly racist jerk who just happened to be seated across the isle. With him, along with the suggested zero-response from anyone else on that airplane either during or after the fact, I'm sorry but our story is now set squarely in the absurd.
Maybe I'm giving the post 9/11 flying public too much credit, but tell me, how do you see this playing out: Some guy suddenly and completely lights up some woman mid-flight with a profanity laced racist rant, and loud enough for the entire cabin to hear. Seriously, half the guys on that plane would have their belts off before he even finished. A male a victim, maybe. A visibly upset female flying alone, no way.
We have some idea about what happened. Why it happened, not so much (but it ain't the can of coke).